Samuel g



(N0 Model.)

S. G. HALL.

BURR FOR KNITTING MACHINES.

No. 275,199. Pafented Apr. 3,1883.

WITNESSES INVENTOR l/ flftorney I N. PETERS Fhoio-Lilhugnphur, Washinmon. 0. C.

UNITED STATES.

PATENT OFFICE.

SAMUEL Gr.- HALL, OF OOHOES, NEW YORK.

BURR FOR KNITTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 275,199, dated'April 3, 1883,

Application filed November 15, 1882.

To all whom it may concern Be it known that I, SAMUEL G. HALL, of Cohoes, Albany county, State of New York, have in vented certain new and useful I mprovements in Burrs for Knitting-Machines, of

I which the following is a specification.

The knitting-burr which I have invented belongs to that class of burrs in which the wings are removable and are detachably connected to the body or stock of the burr; .and it embodies novel features, which can be used separately or conjointly. These features are:

First. Clamping plates or disks provided on interior opposite faces, the one with a numher-say two-of annular ribs, the other with one annularrib,which comes opposite the space between the two ribs on the other plate, in combination with wings which are formed on their oppositeedgeswith correspondingnotches,into which said ribs enter and fit when the plates are pressed together upon theinterposed wings. The notches and ribs are wedge-shaped, so

that they will afford bearing-surfaces which firmly and securely support the wings against the strain which comes upon them when the burr is in use; and the relative arrangement of the ribs on the opposite clamping-disks results in causing them to take even and uniform bearing upon the opposite edges of the wings, so as to reduce the chances of any of the latter working loose and chattering. I am aware that in some burrs the wings have been provided on each edge with a point or projection which enters an annular notch or groove formed for its reception in each clampin g-disk but this arrangement does not afiord the extended even and uniform bearing obtained by me-a feature of decidedim portance, especially in a cast-off burr, which is subjected often to heavy strain, sufficient at times to break the wings. If a single notch and projection only be used, the bearing-surfaces between the wings and clamps, in order to prevent the parts from wearing rapidly where they come in contact, must be extended and elongated, which can only be done by increasing the thickness of the clamping disks or plates, and consequently increasing the bulk and weight of the burr, which is always to be avoided. By distributing as I do the bearing-surfaces I am enabled to obtain great security and permanence without increasing the bulk or weight of the burr.

(No model.)

Second. The combination, with the clamping disks or plates, of a detachable or removable intermediate annular wing-holder which fits upon or engages and is centered and supported by projections or their equivalents formed upon the interioropposite faces of the clamping-disks, or upon the face of one disk only, if desired. So far as I am aware, the slitted wing-holder heretofore employed whenever detachable has been made in the form of a disk, which is fitted upon and is supported by the central hub or bushing of the burr, In my case, however, I use not a disk, but a ring, which is not mounted on and centered by the hub or bushing, but engages projections or their equivalents upon the inner face of one or both of the clamping-disks near the periphery. In this way I very materially diminish the weight of the burr, as well as the cost of its production. Furthermore, I am thereby to reduce the thickness of the burr. When a solid disk centered by and fitting closely on the hub is employed, the mass of metal in the disk which intervenes between 'the hub and that part of the disk that contains the wings adds to the bulkiness of the burr, and, owing to the clamp-plates, causesthe burr to have a bulging shape on the sides. By my improvement this mass of metal is rendered useless and is dispensed with, leaving between the inner periphery .of the ring and the hub an empty space, which may be occupied by the clamp-plates; and consequently while these plates still retain the amount of metal needed to give them the requisite strength they can be so shaped that their inner faces between the ring and-the hub will closely approach one another, thus making the burr much thinner and taking away its bulging sides. In practice I prefer to make use of the same annular ribs which hold the wings to center, and hold the annular wing-holder also and this preferred construction is represented in the accompanying drawings, to which I will now refer in order to more fully explain my invention and the manner in which it is or may be carried into efi'ect.

Figure 1 is a plan view of a knitting-burr embodying mylimprovements, with the clamping-disk A partly broken away and a portion of the annular wing-holder O removed. Fig. 2 is a side elevation or edge view of the same,

enabled one-half of the burr being represented in section. In both figures the burr is represented on an exaggerated scale,in order to show more clearly the construction and arrangement of the parts.

A B are the clamping disks or plates. The former is provided with a tubular hub, A, one end of which is screw-threaded. The disk B fits on the screw-threaded part of hub A, and is held up in place by the clamping-nutB, which screws upon the projecting screw-threaded end of the hub. On the interior opposite faces of the disks are formed the annular ribs, hereinbefore referred to. The diskAis provided near its periphery with two of said ribs, (marked a.) The disk B has one rib only, (marked 1),) which, when the two disks are in position, comes opposite the space intervening between the ribs a. All the ribs have a wedge or approximately V shape in cross-section.

The wing-holding annulus is shown at (3. The burr in the drawings is one designed to be used as a castofl, and the wings have the usual shape for that purpose. The ring 0 is of proper thickness and width to receive the shanks of the wings, and is formed with diagonal or slanting peripheral slits 0, into which the wings are inserted. On one side of the ring are two annular concentric grooves, d, corresponding to and registering with the ribs a, and on the other side of the ring is a single notch, e, which corresponds to and registers with the rib b. It will thus be seen that when the ring is put between the disks and the latter are forced up toward each other by the clamping-nut B the ring will be-centered and held in place by the engagement of the ribs and notches. I thus am enabled to use a-ring detachable and removable of sufficient thickness only to receive the shanks of the wings, in contradistinction to a disk which is mounted on and centered by the hub; and by using with the same set of clamps interchangeable rings (as I propose to do) which are slitted to receive a greater or less number of wings, according to the gage required, I am enabled to obtain cast-01f wheels or burrs of different gages, as desired, without providing an entirely new and distinct wheel for each gage, as has heretofore been the case.

The wings D are of such width that when inserted in their slits their side edges will project slightly beyond the adjoining sides of the ring, and they are notched to correspond with the notches in the ring, as shown plainly in the detached view of one of the wings, Fig. 1, wherethenotchesddand ein the edges of the wing correspond, respectively, to the notches d d and e in the ring. When, therefore, the parts of the burr are assembled, as shown in Fig. 2, the ribs a a and b enterthe ring-notches d d and e, and also the wing-notches d d and 0, thus serving not only to center and hold the ring, but also to drawand clamp the wings tightly and securely in place.

In a cast-oft wheel the working strain comes on the longer curved edge, 1, of the wing, so that consequently the two contiguous surfaces 2 2 of the wings D and ribs a a are the bearing-surfaces on one side. The rib b on the other side, owing to its intermediate position, causes a uniform bearing to be taken on the surfaces 2 2, while the inclined bearingsurfaces 3 and the elongated vertical bearings 4 at the heel of the wings give all needed support to the wings on the other side of the ring.

Having described my improvements and the best way known to me of carrying the same into effect, what I claim, and desire to secure by Letters Patent, is

1. The combination, with the slitted wing holder or receiver, of wings provided on the one edge with the notches d d and on the other edge with notches c, and the clampingdisks provided the one with annular ribs a a and the other with the concentric intermediate annular rib, b, as and for the purposes hereinbefore set forth.

2. The combination, with the wing-holding ring provided with annular side grooves or notches, and the wings provided on their edges with corresponding notches,of clamping plates ordisksprovided on theirinterior opposite faces with corresponding ribs, which enter said notches, and means for drawing together said plates, whereby the said ring is centered and held without other support, and the wings are clamped and bound in place, as and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 2d day of November, 1882.

SAMUEL e. HALL. 

